CN106769952A - Gas DIAL based on incoherent light source - Google Patents
Gas DIAL based on incoherent light source Download PDFInfo
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- CN106769952A CN106769952A CN201710120389.7A CN201710120389A CN106769952A CN 106769952 A CN106769952 A CN 106769952A CN 201710120389 A CN201710120389 A CN 201710120389A CN 106769952 A CN106769952 A CN 106769952A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
Abstract
The invention discloses a kind of gas DIAL based on incoherent light source, the laser radar uses noncoherent incoherent as light source, two laser of operation wavelength are leached using filtering technique, one operation wavelength is located at the peak value of gaseous absorption line, another operation wavelength deviates gaseous absorption line, and the differential absorbing detection of atmospheric gaseous components can be realized by the Received Signal for detecting this two beams laser.The present invention uses time-division multiplex technology, and the measurement to reference laser and flashlight is completed using only single detector, and the system of improve obtains integrated level.The present invention is capable of achieving to detect the gas (such as steam, CO2, HCN, CO) that gaseous absorption line is located at incoherent light source spectral range.The present invention realizes the detection to gas componant using non-coherent detection technology, wavelength-division multiplex technique and time-division multiplex technology, has the advantages that level of integrated system high, all -fiber link, compact conformation, low cost, human eye are comparatively safe.
Description
Technical field
The present invention relates to laser radar, more particularly to a kind of gas DIAL based on incoherent light source.
Background technology
DIAL is with its temporal resolution high, spatial resolution high, detection range long, high measurement essence
The advantages of degree and all weather operations, become the key instrument of atmospheric gaseous components measurement.Difference Absorption technology and three-dimensional are swept
Retouch the combination of technology, be capable of achieving the three-dimensional imaging to the high time-space resolution of Atmospheric components, its application obtain more and more national and
The concern in area.
DIAL generally uses the laser lock-on of two working frequencies, one of frequency to be absorbed in gas
At line, the laser of another frequency deviates gaseous absorption line, the difference of the air clawback signal by measuring this two beams laser
With the concentration of inverting specific gas.Since 20 century 70s, the research of DIAL is just carried out both at home and abroad,
The gas componant of measurement is also varied.Because the absorption spectra of gas with various is different, the light source for using is also different, uses
Light source includes：CO2Laser, dye laser, Ho：YLF laser, Ramar laser, Nd:YAG laser, optical parametric oscillation
Laser etc..For example：Thomas M.Taczak and Dennis K.Killinger report atmosphere vapour and CO within 19982Visit
Survey based on 2 μm of DIALs of laser, it uses 2.006 μm narrow linewidth, wavelength continuously-tuning
Ho：YLF laser.2003,1.57 μm of Difference Absorptions that Michael A.Krainak et al. report a kind of path of integration swashed
Optical radar, light source uses semiconductor laser, by scanning CO2Absorption Line measurement CO2Concentration., Germany in 2008
A.Amediek et al. have developed 1.57 μm of DIALs based on injection seeded OPO, and realize level first
The CO of the air in direction2Concentration is detected.It uses distributed feedback laser as seed light, using Nd:YAG laser conduct
Pump light, 1.57 μm are switched to by KTP nonlinear crystals by 1064nm light.2009, Daisuke Sakaizawa et al. were developed
The DIAL of the optical parametric oscillator based on quasi-phase matched., the James of U.S. NASA in 2010
B.Abshire et al. have developed the Impulsive Difference absorption lidar mobile system based on image intensifer, and its seed light is distribution
Formula feedback laser, it generates peak power after acousto-optic modulator and image intensifer and is the pulsed light of 25W, and enters in 2013
Capable flight test demonstrates its precision better than 1ppmv.
Compared to states such as America and Europes, the development of domestic DIAL is also in the starting stage.Its research institute has：
Shanghai ray machine institute, Harbin Institute of Technology, Anhui ray machine institute of the Chinese Academy of Sciences, Changchun ray machine institute, southwestern CAS Institute of Physics and Harbin Institute of Technology's photoelectricity
Sub- technical research institute etc..
The present inventor has found by research：Existing DIAL is mostly using the relevant of narrow linewidth
LASER Light Source, its cost is high, and structure is relative complex.
The content of the invention
It is an object of the invention to provide a kind of gas DIAL based on incoherent light source, its light source is used
Incoherent light source, the laser radar has low cost, system stabilization, comparatively safe human eye, all -fiber link, compact conformation etc. excellent
Point.
What the present invention was realized in：A kind of gas DIAL based on incoherent light source, including：Light source
Module, the first filtration module, the second filtration module, the first photoswitch, the first beam splitter, image intensifer, outgoing telescope, reception
Telescope, the first smooth delay cell, the second filtration module, attenuator, the second beam splitter, gas absorption cell, the second smooth time delay unit
Part, coupler, detector, data acquisition module and digital signal processing module；
The light source module is used to export pulsed light；First filtration module is used for the filtered optical signal to being input into, defeated
Go out two laser of operation wavelength, an operation wavelength is located at the peak value of under test gas Absorption Line, and another operation wavelength is inclined
From under test gas Absorption Line；
The laser of light source module outgoing exports two laser of operation wavelength, an operation wavelength after the first filtration module
At the peak value of under test gas Absorption Line, another operation wavelength deviates under test gas Absorption Line, the two operation wavelengths
Light source gated through the first photoswitch after, be divided into two-way through the first beam splitter, be used as detection light all the way, another road is used as reference
Light；The detection light incides outgoing telescope and is transmitted into air after amplifying through image intensifer, and the reference light is through decay
After device decays to single photon level, two-way is divided into by the second beam splitter, enters coupler after gas absorption cell all the way；Another road
Enter coupler after the second smooth delay cell time delay；Under test gas are filled with gas absorption cell, shoot laser is made with air
Received Signal after received by receiving telescope after through the first smooth delay cell time delay so that echo-signal and reference
Signal is separated in time domain；Second filtration module is used to filter the atmospheric background of echo-signal；First smooth delay cell output
Echo-signal enters coupler after filtering the atmospheric background through the second filtration module；The signal of coupler outgoing is detected by detector,
The electric signal that detector is detected is converted to data signal by data acquisition module, and digital signal processing module is according to data acquisition module
The data signal inverting Atmospheric components information of block output.
Further, the light source module includes incoherent light source and pulse-modulator, and the incoherent light source is used for defeated
Go out continuous light, the continuous light modulation that the pulse-modulator is used to be input into is pulsed light.
Further, the light source module includes incoherent light source, and the incoherent light source is used to export pulsed light.
Further, first filtration module is wave filter, and the wave filter is wavelength division multiplexer WDM, Prague light
Grid, Fabry Perot interferometer or Mach-Zehnder interferometer.
Further, the gas DIAL based on incoherent light source according to claim, it is special
Levy and be, the output end of the incoherent light source is connected with the input of wave filter, the first output end of wave filter is defeated with second
Go out input of the end with the first photoswitch to be connected, the output end of the first photoswitch is connected with the input of pulse-modulator, arteries and veins
The output end of pulse modulator is connected with the input of the first beam splitter, and the first output end of the first beam splitter is defeated with image intensifer
Enter end connection, the output end of image intensifer is connected with outgoing telescope；
Second output end of the first beam splitter is connected with attenuator, and attenuator is connected with the input of the second beam splitter, the
First output end of two beam splitters is connected with the input of gas absorption cell, the output end of gas absorption cell and the first of coupler
Input is connected, and the second output end of the second beam splitter is connected with the first end of the second smooth delay cell, the second smooth delay cell
The second end be connected with the second input of coupler；
The output end of receiving telescope is connected with the first end of the first smooth delay cell, the second end of the first smooth delay cell
Input with the second filtration module is connected, and the output end of the second filtration module is connected with the 3rd input of coupler；
The output end of coupler is connected with detector, the connection of Detector and data acquisition module, data acquisition module and number
Word signal processing module is connected.
Further, first filtration module includes the second photoswitch, the second Bragg grating and the 3rd Prague light
Grid；
From the laser of incoherent light source outgoing through the second photoswitch-gated, from swashing all the way for the second photoswitch-output
Light is located at the peak value of under test gas Absorption Line through the centre wavelength of the laser of the second Bragg grating-leach, and is opened from the second light
Close-output laser deviates under test gas Absorption Line through the centre wavelength of the laser of the 3rd Bragg grating-leach all the way in addition.
Further, second Bragg grating-, the 3rd Bragg grating be Fiber Bragg Grating FBG；
The output end of the incoherent light source is connected with the input of the second photoswitch, the first output end of the second photoswitch
With the second Bragg grating-input be connected, the second photoswitch-the second output end and the 3rd Bragg grating-input
End connection, the second Bragg grating-output end and the 3rd Bragg grating-output end with the input of the first photoswitch
Connection, the output end of the first photoswitch is connected with the input of pulse-modulator, the output end of pulse-modulator and the first beam splitting
The input connection of device, the first output end of the first beam splitter is connected with the input of image intensifer, the output end of image intensifer
It is connected with outgoing telescope；
Second output end of the first beam splitter is connected with attenuator, and attenuator is connected with the input of the second beam splitter, the
First output end of two beam splitters is connected with the input of gas absorption cell, the output end of gas absorption cell and the first of coupler
Input is connected, and the second output end of the second beam splitter is connected with the first end of the second smooth delay cell, the second smooth delay cell
The second end be connected with the second input of coupler；
The output end of receiving telescope is connected with the first end of the first smooth delay cell, the second end of the first smooth delay cell
Input with the second filtration module is connected, and the output end of the second filtration module is connected with the 3rd input of coupler；
The output end of coupler is connected with detector, the connection of Detector and data acquisition module, data acquisition module and number
Word signal processing module is connected.
Further, second filtration module includes the first Fiber Bragg Grating FBG and optical fiber circulator, and the first light prolongs
When element the second end be connected with the input of optical fiber circulator, the sending and receiving end of optical fiber circulator and the first Fiber Bragg Grating FBG
Connection, the output end of optical fiber circulator is connected with the 3rd input of coupler.
Further, second filtration module is Fabry Perot interferometer, Mach Zehnder interferometer, molecule absorption
Wave filter, Michelson interferometer, luxuriant and rich with fragrance assistant type interferometer or interferometric filter.
Further, the incoherent light source is infrared light supply, the light source module, the first filtration module, the second filtering
Connected using optical fiber between module, the first photoswitch, the first beam splitter, image intensifer, outgoing telescope；The reception is looked in the distance
Mirror, the first smooth delay cell, the second filtration module, attenuator, the second beam splitter, gas absorption cell, the second smooth delay cell, coupling
Connected using optical fiber between clutch, detector.
1st, present invention uses noncoherent incoherent light source as light source.The major advantage of incoherent light source is：
1) laser compared to 0.3 μm to 10 μm, the human eye of 1.5 μm of laser allows the peak power of exposure maximum, more holds
Easily realize eye-safe；
2) incoherent light source is influenceed small by turbulent flow, there is accuracy higher；
3) wide range incoherent light source can reduce the nonlinear effect in optical fiber optics, obtain very big emergent power.
2nd, the present invention uses wavelength-division multiplex technique.The laser center wavelength for needing is gated by the first filtration module, this
Structure is easy to the integrated of gas DIAL function.
3rd, the skew of calibration center wavelength is carried out present invention uses gas absorption cell or for composite gas chamber.By to multiple
Under test gas are filled in conjunction air chamber, the monitoring and calibration of system centre wavelength shift is realized.
4th, present invention uses time-division multiplex technology, by the use of the first smooth delay cell and the second smooth delay cell,
So that reference laser through the signal of gas absorption cell 15, the energy measuring signal of reference laser, the echo-signal of air when
Successively enter detector on domain to detect, detected while being completed to reference light and flashlight using only single detector.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art and advantage, below will be to implementing
Example or the accompanying drawing to be used needed for description of the prior art are briefly described, it should be apparent that, drawings in the following description are only
Only it is some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is that the structure of the gas DIAL based on incoherent light source that the embodiment of the present invention 1 is provided is shown
It is intended to；
Fig. 2 is that the structure of the gas DIAL based on incoherent light source that the embodiment of the present invention 2 is provided is shown
It is intended to；
Fig. 3 is that the structure of the gas DIAL based on incoherent light source that the embodiment of the present invention 3 is provided is shown
It is intended to；
Fig. 4 is that the structure of the gas DIAL based on incoherent light source that the embodiment of the present invention 4 is provided is shown
It is intended to.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art obtained on the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
Embodiment：
Fig. 1 is a kind of structure of gas DIAL based on incoherent light source provided in an embodiment of the present invention
Block diagram, as shown in figure 1, including：Light source module, the first filtration module, the second filtration module, the first photoswitch 3, the first beam splitter
6th, image intensifer 7, outgoing telescope 8, receiving telescope 9, the first smooth delay cell 10, the second filtration module, attenuator 13,
Two beam splitters 14, gas absorption cell 15, the second smooth delay cell 16, coupler 17, detector 18, the sum of data acquisition module 19
Word signal processing module 20；
The light source module is used to export pulsed light.
In an optional embodiment, as shown in figure 1, light source module includes incoherent light source 1 and pulse-modulator 4,
The incoherent light source 1 is used to export continuous light, and the continuous light modulation that the pulse-modulator 4 is used to be input into is pulsed light.
Pulse-modulator 4 includes but is not limited to acousto-optic modulator, electrooptic modulator and intensity modulator, and pulse-modulator 4 is believed by pulse
Number generator 5 drives.
First filtration module is used for the filtered optical signal to being input into, and exports two laser of operation wavelength, a work
Make wavelength at the peak value of under test gas Absorption Line, another operation wavelength deviates under test gas Absorption Line.Positioned at gas to be measured
Laser at the peak value of body Absorption Line can be expressed as on laser, and the laser for deviateing under test gas Absorption Line can be expressed as off
Laser.
The present invention uses noncoherent incoherent light source, and incoherent spectrum is extracted by wave filter, can be to absorption spectra
Gas positioned at the spectral range is detected.Under test gas include but is not limited to steam, CO2、HCN、CO、CH4.As long as to be measured
Gaseous absorption line is located at incoherent light source spectral range, can be measured using laser radar of the invention.
Two laser of operation wavelength are exported after the filtered module of laser of light source module outgoing, an operation wavelength is located at
At the peak value of under test gas Absorption Line, another operation wavelength deviates under test gas Absorption Line, the light of the two operation wavelengths
After source gates through the first photoswitch 3, two-way is divided into through the first beam splitter 6, detection light is used as all the way, another road is used as reference light；
First photoswitch 3 is used to gate on laser and off laser, so that the two laser are separated in time domain.The detection light warp
Image intensifer 7 incides outgoing telescope 8 and is transmitted into air after amplifying.Attenuator 13 is used to for reference light to decay to monochromatic light
Sub- level, so as to prevent the too strong infringement detector 18 of reference optical signal.The reference light decays to single photon water through attenuator 13
After flat, two-way is divided into by the second beam splitter 14, enters coupler 17 after gas absorption cell 15 all the way；The light of another road second prolongs
When the time delay of element 16 after enter coupler 17.Gas absorption cell 15 is used to demarcate shoot laser, its gas componant and to be detected
Atmospheric components are consistent.Under test gas, the Received Signal after shoot laser and atmospheric action are filled with gas absorption cell 15
Through the time delay of the first smooth delay cell 10 after being received by receiving telescope 9, so that echo-signal and reference signal are divided in time domain
Open；Second filtration module is used for wiping out background noise；The echo-signal of the output of the first smooth delay cell 10 is through the second filtration module
Enter coupler 17 after filtering the atmospheric background；The signal of the outgoing of coupler 17 is detected by detector 18, and data acquisition module 19 will
The electric signal of the detection of detector 18 is converted to data signal, and digital signal processing module 20 is exported according to data acquisition module 19
Data signal inverting Atmospheric components information.
In an optional embodiment, as shown in figure 1, first filtration module is wave filter 2, the wave filter 2
It is wavelength division multiplexer WDM, Bragg grating, Fabry Perot interferometer or Mach-Zehnder interferometer.
In an optional embodiment, the wave filter 2 is optical fibre device, and wavelength division multiplexer WDM is multiple for optical fiber wavelength division
It is that Fiber Bragg Grating FBG, Fabry Perot interferometer are optical fiber Fabry Perot interferometer with device WDM, Bragg grating；
Mach-Zehnder interferometer is optical fiber mach-Zehnder interferometer.
The output end of the incoherent light source 1 is connected with the input of wave filter 2, the first output end of wave filter 2 and the
Input of two output ends with the first photoswitch 3 is connected, the output end of the first photoswitch 3 and the input of pulse-modulator 4
Connection, the output end of pulse-modulator 4 is connected with the input of the first beam splitter 6, first output end and light of the first beam splitter 6
The input connection of amplifier 7, the output end of image intensifer 7 is connected with outgoing telescope 8.
Second output end of the first beam splitter 6 is connected with attenuator 13, the input of the beam splitter 14 of attenuator 13 and second
Connection, the first output end of the second beam splitter 14 is connected with the input of gas absorption cell 15, the output end of gas absorption cell 15
First input end with coupler 17 is connected, the first end of the second output end of the second beam splitter 14 and the second smooth delay cell 16
Connection, the second end of the second smooth delay cell 16 is connected with the second input of coupler 17.
The output end of receiving telescope 9 is connected with the first end of the first smooth delay cell 10, the first smooth delay cell 10
Second end is connected with the input of the second filtration module, and the output end of the second filtration module connects with the 3rd input of coupler 17
Connect；
The output end of coupler 17 is connected with detector 18, and detector 18 is connected with data acquisition module 19, data acquisition
Module 19 is connected with digital signal processing module 20.
Data acquisition module 19 can be data collecting card, or other kinds of modulus switching device ADC.
The data signal inverting Atmospheric components information that digital signal processing module 20 is exported according to data acquisition module 19 is
Refer to, the information of the data signal inverting under test gas that digital signal processing module 20 is exported according to data acquisition module 19.Numeral
Signal processing module 20 includes but is not limited to computer, single-chip microcomputer, DSP, FPGA.
In an optional embodiment, as shown in figure 1, second filtration module includes the first Fiber Bragg Grating FBG
12 and optical fiber circulator 11, the second end of the first smooth delay cell 10 is connected with the input of optical fiber circulator 11, fiber annular
The sending and receiving end of device 11 is connected with the first Fiber Bragg Grating FBG 12, and the output end of optical fiber circulator 11 is defeated with the 3rd of coupler 17 the
Enter end connection.
First smooth delay cell 10 and the second smooth delay cell 16 are used to adjust reference laser signal and Received Signal
Time delay so that reference laser through the signal of gas absorption cell 15, the energy measuring signal of reference light, air echo-signal
Successively enter detector in time domain to detect.In an optional embodiment, the first smooth delay cell 10 is time delay optical fiber, the
Two smooth delay cells 16 are time delay optical fiber.
In an optional embodiment, the first beam splitter 6 and the second beam splitter 14 are fiber optic splitter.
In an optional embodiment, detector 18 is single-photon detector, and it includes but is not limited to InGaAs detections
Device, frequency upooaversion single-photon detector, superconducting nano-wire single-photon detector.
In an optional embodiment, the incoherent light source 1 is infrared light supply, the light source module, the first filtering
Module, the second filtration module, the first photoswitch 3, the first beam splitter 6, between image intensifer 7, outgoing telescope 8 using optical fiber connect
Connect；The receiving telescope 9, the first smooth delay cell 10, the second filtration module, attenuator 13, the second beam splitter 14, gas are inhaled
Receives pond 15, the second smooth delay cell 16, between coupler 17, detector 18 using optical fiber connect.
In an optional embodiment, the optical maser wavelength of the output of the incoherent light source 1 is 1.5um；The light amplification
Device 7 is erbium-doped optical fiber amplifier EDFA.
It should be noted that optics of the invention can be optical fibre device, or Traditional optics.Example
Such as, the first beam splitter and the second beam splitter can be the beam splitters such as prism, or fiber optic splitter.Incoherent light source can be with
It is optical fiber laser, it is also possible to be the laser of non-optical fiber.
The gas DIAL based on incoherent light source that the present invention is provided has the advantages that：
1st, present invention uses noncoherent incoherent light source as light source.The major advantage of incoherent light source is：
1) laser compared to 0.3 μm to 10 μm, the human eye of 1.5 μm of laser allows the peak power of exposure maximum, more holds
Easily realize eye-safe；
2) incoherent light source is influenceed small by turbulent flow, there is accuracy higher；
3) wide range incoherent light source can reduce the nonlinear effect in optical fiber optics, obtain very big emergent power.
2nd, the present invention uses wavelength-division multiplex technique.The laser center wavelength for needing is gated by the first filtration module, this
Structure is easy to the integrated of gas DIAL function.
3rd, the skew of calibration center wavelength is carried out present invention uses gas absorption cell or for composite gas chamber.By to multiple
Under test gas are filled in conjunction air chamber, the monitoring and calibration of system centre wavelength shift is realized.
4th, present invention uses time-division multiplex technology, by the use of the first smooth delay cell and the second smooth delay cell,
So that reference laser through the signal of gas absorption cell 15, the energy measuring signal of reference laser, the echo-signal of air when
Successively enter detector on domain to detect, detected while being completed to reference light and flashlight using only single detector.
Embodiment 2
Fig. 2 is another gas DIAL based on incoherent light source provided in an embodiment of the present invention
Structured flowchart, embodiment 2 and the concrete form that the difference of embodiment 1 is light source module, as shown in Fig. 2 the light source module
Including incoherent light source 1, the incoherent light source 1 is used to export pulsed light.In example 2, because incoherent light source 1 is exported
Pulsed light, therefore, pulse-modulator is not needed in the present embodiment.The remainder of the present embodiment is same as Example 1, no longer goes to live in the household of one's in-laws on getting married
State.
Embodiment 3
Fig. 3 is another gas DIAL based on incoherent light source provided in an embodiment of the present invention
Structured flowchart, embodiment 3 and the concrete form that the difference of embodiment 1 is the first filtration module.
As shown in figure 3, first filtration module includes the second photoswitch 2-1, the second Bragg grating 2-2 and the 3rd cloth
Glug grating 2-3；
Gated through the second photoswitch 2-1 from the laser of the outgoing of incoherent light source 1, from the second photoswitch 2-1 outputs
The centre wavelength of the laser that laser is leached through the second Bragg grating 2-2 is located at the peak value of under test gas Absorption Line all the way, from
The centre wavelength of the other laser that laser is leached through the 3rd Bragg grating 2-3 all the way of the second photoswitch 2-1 outputs deviates to be treated
Survey gaseous absorption line.
In an optional embodiment, the second Bragg grating 2-2, the 3rd Bragg grating 2-3 are optical fiber
Bragg grating.
The output end of the incoherent light source 1 is connected with the input of the second photoswitch 2-1, and the of the second photoswitch 2-1
One output end is connected with the input of the second Bragg grating 2-2, the second output end and the 3rd Prague of the second photoswitch 2-1
The input connection of grating 2-3, the output end of the second Bragg grating 2-2 and the output end of the 3rd Bragg grating 2-3 with
The input connection of the first photoswitch 3, the output end of the first photoswitch 3 is connected with the input of pulse-modulator 4, impulse modulation
The output end of device 4 is connected with the input of the first beam splitter 6, the first output end of the first beam splitter 6 and the input of image intensifer 7
End connection, the output end of image intensifer 7 is connected with outgoing telescope 8；
Second output end of the first beam splitter 6 is connected with attenuator 13, the input of the beam splitter 14 of attenuator 13 and second
Connection, the first output end of the second beam splitter 14 is connected with the input of gas absorption cell 15, the output end of gas absorption cell 15
First input end with coupler 17 is connected, the first end of the second output end of the second beam splitter 14 and the second smooth delay cell 16
Connection, the second end of the second smooth delay cell 16 is connected with the second input of coupler 17；
The output end of receiving telescope 9 is connected with the first end of the first smooth delay cell 10, the first smooth delay cell 10
Second end is connected with the input of the second filtration module, and the output end of the second filtration module connects with the 3rd input of coupler 17
Connect；
The output end of coupler 17 is connected with detector 18, and detector 18 is connected with data acquisition module 19, data acquisition
Module 19 is connected with digital signal processing module 20.
In addition to the first filtration module, the remainder of the present embodiment is same as Example 1, repeats no more.Certainly, this reality
The light source module applied in example also can be in the form of light source module in embodiment 2.
Embodiment 4
Fig. 4 is another gas DIAL based on incoherent light source provided in an embodiment of the present invention
Structured flowchart, embodiment 4 and the concrete form that the difference of embodiment 1 is the second filtration module.
As shown in figure 4, second filtration module can also be the second filter element 122, the second filter element 122 is method
Fabry-Perot interferometer, Mach Zehnder interferometer, molecule absorption wave filter, Michelson interferometer, luxuriant and rich with fragrance assistant type interferometer or dry
Relate to optical filter.Preferably, second filtration module is that optical fibre device, i.e. Fabry Perot interferometer are optical fiber Fabry-handkerchief
Luo Gan's interferometer, Mach Zehnder interferometer are optical fiber mach Zehnder interferometer, molecule absorption wave filter for optical fiber molecule absorption is filtered
Device, Michelson interferometer are fiber Michelson interferometer, luxuriant and rich with fragrance assistant type interferometer is optical fiber phenanthrene assistant type interferometer.
Second end of the first smooth delay cell 10 is connected with the input of the second filter element, the output of the second filter element
End is connected with the 3rd input of coupler 17.
In addition to the first filtration module, the remainder of the present embodiment is same as Example 1, repeats no more.Certainly, this reality
The light source module applied in example also can be in the form of light source module in embodiment 2；The first filtration module in the present embodiment also may be used
In the form of the first filtration module in embodiment 3, repeat no more.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (10)
1. a kind of gas DIAL based on incoherent light source, it is characterised in that including：Light source module, first
Filtration module, the second filtration module, the first photoswitch (3), the first beam splitter (6), image intensifer (7), outgoing telescope (8),
Receiving telescope (9), the first smooth delay cell (10), the second filtration module, attenuator (13), the second beam splitter (14), gas
Absorption cell (15), the second smooth delay cell (16), coupler (17), detector (18), data acquisition module (19) and numeral letter
Number processing module (20)；
The light source module includes incoherent light source (1), and the light source module is used to export pulsed light；First filtration module
For the filtered optical signal to being input into, two laser of operation wavelength are exported, an operation wavelength is located under test gas Absorption Line
Peak value at, another operation wavelength deviate under test gas Absorption Line；
The laser of light source module outgoing exports two laser of operation wavelength after the first filtration module, and an operation wavelength is located at
At the peak value of under test gas Absorption Line, another operation wavelength deviates under test gas Absorption Line, the light of the two operation wavelengths
After source gates through the first photoswitch (3), two-way is divided into through the first beam splitter (6), detection light is used as all the way, another road is used as reference
Light；The detection light incides outgoing telescope (8) and is transmitted into air, the reference light after amplifying through image intensifer (7)
After decaying to single photon level through attenuator (13), two-way is divided into by the second beam splitter (14), all the way through gas absorption cell (15)
Enter coupler (17) afterwards；Another road enters coupler (17) after the second smooth delay cell (16) time delay；Gas absorption cell
(15) under test gas are filled with, after the Received Signal after shoot laser and atmospheric action is received by receiving telescope (9)
Through the first smooth delay cell (10) time delay, so that echo-signal and reference signal are separated in time domain；Second filtration module is used
In the atmospheric background for filtering echo-signal；The echo-signal of the first smooth delay cell (10) output is filtered greatly through the second filtration module
Enter coupler (17) after gas background；The signal of coupler (17) outgoing is detected by detector (18), data acquisition module (19)
The electric signal that detector (18) is detected is converted into data signal, digital signal processing module (20) is according to data acquisition module
(19) the data signal inverting Atmospheric components information of output.
2. the gas DIAL based on incoherent light source according to claim 1, it is characterised in that described
Light source module includes pulse-modulator (4), and the incoherent light source (1) is used for exporting continuous light, the pulse-modulator (4)
In will be input into continuous light modulation be pulsed light.
3. the gas DIAL based on incoherent light source according to claim 1, it is characterised in that described
Incoherent light source (1) is for exporting pulsed light.
4. the gas DIAL based on incoherent light source according to claim 2, it is characterised in that described
First filtration module is wave filter (2), and the wave filter (2) is wavelength division multiplexer WDM, Bragg grating, Fabry Perot are done
Interferometer or Mach-Zehnder interferometer.
5. the gas DIAL based on incoherent light source according to claim 4, it is characterised in that described
The output end of incoherent light source (1) is connected with the input of wave filter (2), and the first output end of wave filter (2) is exported with second
Input with the first photoswitch (3) is held be connected, the output end of the first photoswitch (3) and the input of pulse-modulator (4)
Connection, the output end of pulse-modulator (4) is connected with the input of the first beam splitter (6), the first output of the first beam splitter (6)
End is connected with the input of image intensifer (7), and the output end of image intensifer (7) is connected with outgoing telescope (8)；
Second output end of the first beam splitter (6) is connected with attenuator (13), and attenuator (13) is defeated with the second beam splitter (14)
Enter end connection, the first output end of the second beam splitter (14) is connected with the input of gas absorption cell (15), gas absorption cell
(15) output end is connected with the first input end of coupler (17), and the second output end and second light of the second beam splitter (14) prolong
When element (16) first end connection, the second end of the second smooth delay cell (16) connects with the second input of coupler (17)
Connect；
The output end of receiving telescope (9) is connected with the first end of the first smooth delay cell (10), the first smooth delay cell (10)
The second end be connected with the input of the second filtration module, the 3rd input of the output end of the second filtration module and coupler (17)
End connection；
The output end of coupler (17) is connected with detector (18), and detector (18) is connected with data acquisition module (19), data
Acquisition module (19) is connected with digital signal processing module (20).
6. the gas DIAL based on incoherent light source according to claim 2, it is characterised in that described
First filtration module includes the second photoswitch (2-1), the second Bragg grating (2-2) and the 3rd Bragg grating (2-3)；
Gated through the second photoswitch (2-1) from the laser of incoherent light source (1) outgoing, from the second photoswitch (2-1) output
The centre wavelength of laser that is leached through the second Bragg grating (2-2) of laser all the way be located at the peak value of under test gas Absorption Line
Place, from the middle cardiac wave of the other laser that laser is leached through the 3rd Bragg grating (2-3) all the way of the second photoswitch (2-1) output
It is long to deviate under test gas Absorption Line.
7. the gas DIAL based on incoherent light source according to claim 6, it is characterised in that described
Second Bragg grating (2-2), the 3rd Bragg grating (2-3) are Fiber Bragg Grating FBG；
The output end of the incoherent light source (1) is connected with the input of the second photoswitch (2-1), the second photoswitch (2-1)
First output end is connected with the input of the second Bragg grating (2-2), second output end and the 3rd of the second photoswitch (2-1)
The input connection of Bragg grating (2-3), the output end of the second Bragg grating (2-2) and the 3rd Bragg grating (2-3)
Input of the output end with the first photoswitch (3) be connected, output end and the pulse-modulator (4) of the first photoswitch (3)
Input is connected, and the output end of pulse-modulator (4) is connected with the input of the first beam splitter (6), and the of the first beam splitter (6)
One output end is connected with the input of image intensifer (7), and the output end of image intensifer (7) is connected with outgoing telescope (8)；
Second output end of the first beam splitter (6) is connected with attenuator (13), and attenuator (13) is defeated with the second beam splitter (14)
Enter end connection, the first output end of the second beam splitter (14) is connected with the input of gas absorption cell (15), gas absorption cell
(15) output end is connected with the first input end of coupler (17), and the second output end and second light of the second beam splitter (14) prolong
When element (16) first end connection, the second end of the second smooth delay cell (16) connects with the second input of coupler (17)
Connect；
The output end of receiving telescope (9) is connected with the first end of the first smooth delay cell (10), the first smooth delay cell (10)
The second end be connected with the input of the second filtration module, the 3rd input of the output end of the second filtration module and coupler (17)
End connection；
The output end of coupler (17) is connected with detector (18), and detector (18) is connected with data acquisition module (19), data
Acquisition module (19) is connected with digital signal processing module (20).
8. the gas DIAL based on incoherent light source according to claim 5 or 7, it is characterised in that
Second filtration module includes the first Fiber Bragg Grating FBG (12) and optical fiber circulator (11), the first smooth delay cell (10)
The second end be connected with the input of optical fiber circulator (11), the sending and receiving end of optical fiber circulator (11) and the first optical fiber Bragg light
Grid (12) are connected, and the output end of optical fiber circulator (11) is connected with the 3rd input of coupler (17).
9. the gas DIAL based on incoherent light source according to claim 5 or 7, it is characterised in that
Second filtration module is Fabry Perot interferometer, Mach Zehnder interferometer, molecule absorption wave filter, Mechelson, A. A. are done
Interferometer, luxuriant and rich with fragrance assistant type interferometer or interferometric filter.
10. the gas DIAL based on incoherent light source according to claim 5 or 7, it is characterised in that
The incoherent light source (1) is infrared light supply, the light source module, the first filtration module, the second filtration module, the first photoswitch
(3), connected using optical fiber between the first beam splitter (6), image intensifer (7), outgoing telescope (8)；The receiving telescope
(9), the first smooth delay cell (10), the second filtration module, attenuator (13), the second beam splitter (14), gas absorption cell (15),
Second smooth delay cell (16), between coupler (17), detector (18) using optical fiber connect.
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Effective date of registration: 20210730 Address after: 210044 915, meteorological building, Nanjing University of information engineering, Nanjing, Jiangsu Province Patentee after: Xia Haiyun Address before: Room 306, building 59, Qiyuan, No.18, East Shanhu Road, Qixia District, Nanjing City, Jiangsu Province, 210000 Patentee before: NANJING HONGLULIN LASER RADAR TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20210810 Address after: 211500 room 407-1, building A2, No. 9 Kechuang Avenue, intelligent manufacturing Industrial Park (Zhihe Park), Jiangbei new area, Nanjing, Jiangsu Province Patentee after: Nanjing taiaixin Technology Co.,Ltd. Address before: 210044 915, meteorological building, Nanjing University of information engineering, Nanjing, Jiangsu Province Patentee before: Xia Haiyun |
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